При 5log0,5(7-x)#0
log0,5(7-x)#0
log0,5(7-x)#Log0,5 (0,5^0)
7-x#1
-x#-6
X#6
{X#6
{7-x>0
{x#6
{-x>-7
{х#6
{x<7
Ответ:(-~;6)U(6;7)
X=(x-6)²
x=x²-12x+36
-x²+13c-36=0
-(x-9)(x-4)=0
(x-9)(x-4)=o
x-9=0. x-4=0
x=9 x=4
-√x→-4=-2
x-6→4-6=-2
-√x→-9=-3
x-6→9-6=3
ответ х=4
![(1 \frac{1}{2} +2 \frac{2}{3})/1 \frac{2}{3} = (\frac{3}{2}+ \frac{8}{3} )/1 \frac{2}{3} = \frac{25}{6}/ \frac{8}{3} = \frac{5}{2}](https://tex.z-dn.net/?f=%281%20%5Cfrac%7B1%7D%7B2%7D%20%2B2%20%5Cfrac%7B2%7D%7B3%7D%29%2F1%20%5Cfrac%7B2%7D%7B3%7D%20%3D%20%28%5Cfrac%7B3%7D%7B2%7D%2B%20%5Cfrac%7B8%7D%7B3%7D%20%29%2F1%20%5Cfrac%7B2%7D%7B3%7D%20%3D%20%5Cfrac%7B25%7D%7B6%7D%2F%20%5Cfrac%7B8%7D%7B3%7D%20%3D%20%5Cfrac%7B5%7D%7B2%7D%20)
35,4*(62,4-49,9)-12,5*15,4=35,4*12,5-12,5*15,4=12,5(35,4-15,4)=12,5*20=250
4y-x=12 7y=9 y=7/9
3y+x=-3 x=-7/3-3 x=-16/3
два решения